﻿/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2016 Thomas Braun, Jens Klingen, Robin Krom
 * 
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
using System;
using System.Drawing;
using System.IO;
using Greenshot.Drawing.Fields;
using Greenshot.Plugin.Drawing;
using GreenshotPlugin.Core;
using System.Drawing.Drawing2D;
using log4net;
using System.Runtime.Serialization;
using GreenshotPlugin.Effects;
using GreenshotPlugin.Interfaces.Drawing;

namespace Greenshot.Drawing {
	/// <summary>
	/// Description of BitmapContainer.
	/// </summary>
	[Serializable] 
	public class ImageContainer : DrawableContainer, IImageContainer {
		private static readonly ILog Log = LogManager.GetLogger(typeof(ImageContainer));

		private Image image;

		/// <summary>
		/// This is the shadow version of the bitmap, rendered once to save performance
		/// Do not serialize, as the shadow is recreated from the original bitmap if it's not available
		/// </summary>
		[NonSerialized]
		private Image _shadowBitmap;

		/// <summary>
		/// This is the offset for the shadow version of the bitmap
		/// Do not serialize, as the offset is recreated
		/// </summary>
		[NonSerialized]
		private Point _shadowOffset = new Point(-1, -1);

		public ImageContainer(Surface parent, string filename) : this(parent) {
			Load(filename);
		}

		public ImageContainer(Surface parent) : base(parent) {
			FieldChanged += BitmapContainer_OnFieldChanged;
			Init();
		}

		protected override void OnDeserialized(StreamingContext streamingContext)
		{
			base.OnDeserialized(streamingContext);
			Init();
		}

		private void Init()
		{
			CreateDefaultAdorners();
		}

		protected override void InitializeFields() {
			AddField(GetType(), FieldType.SHADOW, false);
		}

		protected void BitmapContainer_OnFieldChanged(object sender, FieldChangedEventArgs e) {
			if (sender.Equals(this)) {
				if (FieldType.SHADOW.Equals(e.Field.FieldType)) {
					ChangeShadowField();
				}
			}
		}

		public void ChangeShadowField() {
			bool shadow = GetFieldValueAsBool(FieldType.SHADOW);
			if (shadow) {
				CheckShadow(true);
				Width = _shadowBitmap.Width;
				Height = _shadowBitmap.Height;
				Left = Left - _shadowOffset.X;
				Top = Top - _shadowOffset.Y;
			} else {
				Width = image.Width;
				Height = image.Height;
				if (_shadowBitmap != null) {
					Left = Left + _shadowOffset.X;
					Top = Top + _shadowOffset.Y;
				}
			}
		}

		public Image Image {
			set {
				// Remove all current bitmaps
				DisposeImage();
				DisposeShadow();
				image = ImageHelper.Clone(value);
				bool shadow = GetFieldValueAsBool(FieldType.SHADOW);
				CheckShadow(shadow);
				if (!shadow) {
					Width = image.Width;
					Height = image.Height;
				} else {
					Width = _shadowBitmap.Width;
					Height = _shadowBitmap.Height;
					Left = Left - _shadowOffset.X;
					Top = Top - _shadowOffset.Y;
				}
			}
			get { return image; }
		}

		/// <summary>
		/// The bulk of the clean-up code is implemented in Dispose(bool)
		/// This Dispose is called from the Dispose and the Destructor.
		/// When disposing==true all non-managed resources should be freed too!
		/// </summary>
		/// <param name="disposing"></param>
		protected override void Dispose(bool disposing) {
			if (disposing) {
				DisposeImage();
				DisposeShadow();
			}
			base.Dispose(disposing);
		}

		private void DisposeImage() {
			image?.Dispose();
			image = null;
		}
		private void DisposeShadow() {
			_shadowBitmap?.Dispose();
			_shadowBitmap = null;
		}



		/// <summary>
		/// Make sure the content is also transformed.
		/// </summary>
		/// <param name="matrix"></param>
		public override void Transform(Matrix matrix) {
			int rotateAngle = CalculateAngle(matrix);
			// we currently assume only one transformation has been made.
			if (rotateAngle != 0) {
				Log.DebugFormat("Rotating element with {0} degrees.", rotateAngle);
				DisposeShadow();
				using (var tmpMatrix = new Matrix()) {
					using (image)
					{
						image = ImageHelper.ApplyEffect(image, new RotateEffect(rotateAngle), tmpMatrix);
					}
				}
			}
			base.Transform(matrix);
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="filename"></param>
		public void Load(string filename) {
			if (!File.Exists(filename))
			{
				return;
			}
			// Always make sure ImageHelper.LoadBitmap results are disposed some time,
			// as we close the bitmap internally, we need to do it afterwards
			using (var tmpImage = ImageHelper.LoadImage(filename)) {
				Image = tmpImage;
			}
			Log.Debug("Loaded file: " + filename + " with resolution: " + Height + "," + Width);
		}

		/// <summary>
		/// This checks if a shadow is already generated
		/// </summary>
		/// <param name="shadow"></param>
		private void CheckShadow(bool shadow) {
			if (shadow && _shadowBitmap == null) {
				using (var matrix = new Matrix()) {
					_shadowBitmap = ImageHelper.ApplyEffect(image, new DropShadowEffect(), matrix);
				}
			}
		}

		/// <summary>
		/// Draw the actual container to the graphics object
		/// </summary>
		/// <param name="graphics"></param>
		/// <param name="rm"></param>
		public override void Draw(Graphics graphics, RenderMode rm) {
			if (image != null) {
				bool shadow = GetFieldValueAsBool(FieldType.SHADOW);
				graphics.SmoothingMode = SmoothingMode.HighQuality;
				graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
				graphics.CompositingQuality = CompositingQuality.HighQuality;
				graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;

				if (shadow) {
					CheckShadow(true);
					graphics.DrawImage(_shadowBitmap, Bounds);
				} else {
					graphics.DrawImage(image, Bounds);
				}
			}
		}

		public override bool HasDefaultSize => true;

		public override Size DefaultSize => image.Size;
	}
}
